Undercover. (KBTBB)

Aika Misaki is an undercover detective. Being assigned a case to investigate the hotel of Tres Spade with the possibility of illegal activity taking place at the first and only casino hotel in Tokyo. Aika took the opportunity to work as a common, housekeeping maid to keep her identity undercover; but after a frustrating shift, she finds herself breaking a valuable artefact that was going to be sold at one of the largest Black Market Auctions in the world. But after being caught by the suspected seller of the artefact; Aika finds herself taking the place of the artefact at the Black Market Auctions.

Once she was bought for an astonishing price; Aika finds herself in front of the five auction sponsors. After being ordered to choose who buy's her out of the choose of; a thief, an artist, a billionaire, a detective or a mobster, Aika chooses the most dangerous one out of them all; the mobster. With the belief that Aika can not only take down the auctions single-handedly; she believes she can also take down the Japanese based mafia organisation, Ice Dragons.